Lifting-jack



A. NEAL.

LIFTING JACK. A PucAT'mN FILED MAR. 29. 1919.

Patented O0t.19,1920.

2 SHEETS-SHEET 1.

A'TTOR/VEM A. NEAL.

LIFTING JACK. APPLICATION FILED MAR. 29, 1919.

Patented Oct. 19, 1920,

2 SHEETS-HEET 2.

lA/VE/VTOR.

,AZZertjfea ATTO R N E UNITED STATES PATENT 1 OFFICE.

' aALBERT NEAL, OF KOKOMO, INDIANA.

A LIFTING-J'AGK. 7

Specification of Letters Patent.

Patented Oct. 19,1920.

7 Application filed March 29, 1919. Serial No. 286,021.

This invention relates to that class of lifting-jacks shown and described in my pending application filed October 2, 1918,

g No. 256,496; and one of the objects of the present invention consists in'the provision of a lifting-jack of the above character wherein the construction is considerably simplified, through the elimination of a number of parts, but still enabling the jack to perform all of the work capable of being performed with my former construction. I A further object of the invention, in which the number of parts are reduced,'enables the present jack to be manufactured more economically,wit'h a corresponding reduction in the cost of replacement of parts, and wherein the liability of the .j ackbecoming impaired is reduced.

.l accomplish the above objects ofthe in vention, and such others as may appear from a perusal of the following description and claims, by means of the construction illustrated in the drawings, forming a part hereof, in which- Figure 1 is aside elevation of my improved lifting-j ack, showing the position of the pawls when the actuator-lever is in an.

elevated position. vFig. 2 is a view similar to Fig. 1, except that the pawls are shown in a changed position, with the actuatorlever depressed. Fig. 3 is a view similar to Fig. 2, except that both pawls are shown as being completely disconnected from the lifting-ba-r, as when the actuator-lever 1s 1n an abnormally depressed condition. Fig. 4 is a view partly in elevation and partly in cross section, on. the line 4-4 in Flg. 3. F1g. 5 1s a horizontal cross section on the line 5-5 in Fig. 4. Fig. 6 is a view of the opposite side of the actuator-lever fromthat shown in Fig. 3. Fig. 7 is a View of that side of the jack opposite the side shown in Fig. 3.

Referring to the drawings, 10 represents the lifting-jack housing which is provided with a pair of parallel flanges 11 and 12 between which is formed a passageway 13 to provide a guideway for a lifting-bar 14. Flanges 11 and 12 are provided on their opposing faces with one or more ribs 15 which engage corresponding channels or rooves 1 1n l1ft1ng-bar14 and which preved t the said bar from accidental lateral displacement from passageway 13. Lifting-bar 14 is also provided in one edgewith a series of teeth 20 by which bar 14 is engaged and moved longitudinally and held in an elevated position in supporting theload. Lifting-bar 14 is moved longitudinally in passageway 13 by means of a pair of aotuator-pawls 22 and 23, the latter terminating at their lower ends in transverse trunnions 24 which engage a pair of apertures 25 properly'positioned in the adacent end of actuator-lever 27 suitably pivoted in extension 28 of lifting-jack housmg 10, at 29. By placing apertures'25at the proper radli from the axis of the pivot 29 they move through a determined arc of travel when lever 27 is oscillated thereby impartlng not only the desired throw to pawls 22 and 23 but also imparting an alternating movement to said pawls. As shown in Fig. 1 of the drawings with lever 27 in its elevated position and ready to be depressed, pawl 22 sustains the load while pawl 23 is bein lowered from one tooth to the next tooth below, assuming the position shown in Fig. 2 of the drawings. Further depression of lever 27 1s prevented'by means of a stoplug 30 on pawl 23 coming into contact with a rotatable stop 31 which is mounted in outer flange 32 of extension 28, of lifting jack housing 10. On moving lever 27 upwardly, pawl 23 will move lifting-bar 14 upwardly with the load. ,In fact, pawl 23 performs all the lifting, pawl 22 merely sustaining bar 14 and the load when pawl 23 is disengaged and is moving downwardly over teeth 20 of the bar 14. Examining Fig. 4 of the drawings, it will be noted that stop 31 is formed on a reversed curve and occupies a position so that its upper end will be contacted by stop-lug 30 when lever 27 is depressed,

' and the lower end of stop 31 is contacted by a-boss 35 (Fig. 2) whereby the upward move-" ment of lever 27 is limited. Stop 31 may be rotated by means of a thumb-nut 36 so as to shift 1ts upper end out of the path of travel ofstop-lug 30, thereby permitting lever 27 to be depressed an abornmal distance. This movement is sufiicient to carry both. the trunnions 24 of pawls 22 and 23 in advance of a perpendicular plane extending through pivot 29 and disconnect both of said pawls from the teeth20 in lifting-bar 14,.thereby lever 27.

allowingthe' latter to drop and assume the position shown in Fig. 3 of the drawings.

To prevent displacement of lever 27 from extension 28 of lifting-jack housing 10, I provide the pivot 29 with a head 40 which is inserted through an aperture 41 in side wall of extension 28, which aperture is somewhat above the normal working position of the pivot, the latter being moved into itsnormal operative position by means of'a slot 42 which communicates with aperture 41 7 Pawls 22 and 23 are held against accidental displacement bytheir arrangement between the adjacent inner wall of extension 28 and aflange 45"(Figs.'6 and/7) on lever 27,.said

lioldi'ng pawls22'and 23 normally into contact with lifting-bar 14 is eliminated.

.Having thus .fiully described my said invention, what I desire to secure by Letters Patent, is

A lifting-1 ack comprising a tooth liftingbar, means for supporting saidbar parallel j with its longitudinal plane of travel, a rocking actuator lever" pivoted a determined lateral distance from said bar, a pair of pawls pivoted to said lever v and .sufiicient distances fromits ivot to cause disengagement'of both paw s from'the bar with'the I lever depressed below its normal range of travel,'a stop-plug carried by one of said pawls,'and a stop susceptible of being moved into and out'of the path of travel of said stop lu'g at the will of the operator.

In witness whereof, I have hereunto {set my hand and seal'at Indianapolis, Indiana, this 21st day of-March, A. D. one thousand nine hundred and nineteen.

'ALBZEERT NEAL. a 8. 

